Watch casing



FIG. 1 is a top plan view of a watch casing showing my new design;

FIG. 2 is a front elevational view thereof with the rear elevation view a mirror image;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a top perspective view thereof looking in on the right side.

The portions of the drawings provided by broken line are intended to reflect environment, and do not form a part of my design. 

The ornamental design for a watch casing, as shown and described. 